Terraform：如何仅在支持请求的实例类型的区域中请求 AWS EC2 实例？

Question

有没有办法在请求实例之前获取实例类型（例如 t3.medium）可用的可用区？我正在尝试运行以下代码，但对于某些区域，它会因以下错误而失败：

Error: Error launching source instance: Unsupported: Your requested instance type (t3.micro) is not supported in your requested Availability Zone (us-east-1e). Please retry your request by not specifying an Availability Zone or choosing us-east-1a, us-east-1b, us-east-1c, us-east-1d, us-east-1f.

显然，我可以手动将可用区域指定为受支持的区域之一，但我想最小化硬编码可用区域。

Answer 1

如评论中所述，如果您愿意在首选类型不可用的情况下启动不同类型的实例，那么您可以使用aws_ec2_instance_type_offering数据源来回退到t2受影响可用区中的实例系列。

以下 Terraform 代码将输出可用区映射到允许的实例类型，首选t3.micro但回退到系列不可用的t2.micros t3：

provider "aws" {
  region = "us-east-1"
}

data "aws_availability_zones" "all" {}

data "aws_ec2_instance_type_offering" "example" {
  for_each = toset(data.aws_availability_zones.all.names)

  filter {
    name   = "instance-type"
    values = ["t2.micro", "t3.micro"]
  }

  filter {
    name   = "location"
    values = [each.value]
  }

  location_type = "availability-zone"

  preferred_instance_types = ["t3.micro", "t2.micro"]
}

output "foo" {
  value = { for az, details in data.aws_ec2_instance_type_offering.example : az => details.instance_type }
}

这输出：

foo = {
  "us-east-1a" = "t3.micro"
  "us-east-1b" = "t3.micro"
  "us-east-1c" = "t3.micro"
  "us-east-1d" = "t3.micro"
  "us-east-1e" = "t2.micro"
  "us-east-1f" = "t3.micro"
}

您应该能够迭代可用区来设置aws_instance资源的实例类型，而不是仅仅输出它。

或者，您可以t3通过将输出更改为以下内容来过滤输出以将其减少为可以提供实例系列的可用区列表：

output "foo" {
  value = keys({ for az, details in data.aws_ec2_instance_type_offering.example : az => details.instance_type if details.instance_type == "t3.micro" })
}

这将输出以下内容，跳过不包含t3实例系列的可用区：

foo = [
  "us-east-1a",
  "us-east-1b",
  "us-east-1c",
  "us-east-1d",
  "us-east-1f",
]